Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e61fe0ec3d6228…

MALICIOUS

PDF

77.9 KB Created: 2021-08-23 11:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed81d70bf2e1eb4e14a1215f446c1221 SHA-1: 20578dbc1456878035aebb0875b5761c84cd30f6 SHA-256: 35e61fe0ec3d62282b504aa96a9b84d7de82f87df95f4a63c44ef75c4f30d038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=scold+meaning+in+malayalam PDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7082d8fc1---nuparoguvopiluxisep.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1338b5d45062e5c9bd6c210755905ff3/lizulakeg.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/30520239752.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13f14218a---41059005768.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac548c235bf---pagenos.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210623_0995570B77AB87A3.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a21441df6b7---fawusigevilokalusazuruxab.pdfIn PDF document text
    • http://runbo.net/upfiles/files/1629409086603.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/24977158386.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609825a63e256---90167976450.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/tagoxewun.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088731064d98---pimomumibuwemexudesuko.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ef331754---dowanaro.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/puropetedomenodapiliped.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c681b0c58---87877250649.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2901066c---tefafomiromideronutupegu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da500bae3e7---60560667750.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26a7c5007---9508716257.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/85880211088.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/vujapazerilemakawut.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jekugidomozob.pdfIn PDF document text
    • https://codecs.ro/images/file/vujejolisariwosaduni.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 10536 bytes
SHA-256: 3f5813d28ecac04b7a4b02fedae3cd55c2f1924a8f19b557952ada29552a26ba
font_02_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 17408 bytes
SHA-256: cf886cc15869587ab58907f08ea8cd352bd000c15ffeca859aacafd780de8e01

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